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Microchip Technology 93LC56AX/SN
- Part No.:
- 93LC56AX/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56AX/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,128
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Product details
Overview
93LC56AX/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial/automotive temperature support (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, and power-on/off data protection - deployed in embedded system configuration storage and sensor calibration memory.
For engineers reviewing the 93LC56AX/SN datasheet, 93LC56AX/SN pinout, 93LC56AX/SN application, or 93LC56AX/SN equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), SOIC-8 package (SN), 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire controllers requiring CS/CLK/DI/DO timing compliance.
Technical Context
The 93LC56AX/SN implements a synchronous serial interface with chip-select–gated clocking, where instructions (READ, WRITE, ERASE, ERAL, WRAL) are decoded from 2-bit opcodes followed by 8-bit address and optional data. Its internal logic enforces power-on write protection and requires explicit EWEN/EWDS commands to enable/disable programming - preventing accidental overwrites during brown-out or noise events.
Memory access uses rising-edge clock sampling for DI and DO; DO provides dual-mode operation - serial data output during READ and Ready/Busy status polling during erase/write. The device enters High-Z on falling CS edge and remains in Standby (ICC ≤ 5 µA) when CS = low, supporting ultra-low-power system sleep modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin; supports byte-level addressing without word alignment overhead. |
| VCC range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic domains; POR threshold at 1.5 V prevents corruption during power ramp. |
| Endurance | 1,000,000 erase/write cycles - enables field-updatable calibration tables and firmware parameter storage in long-life industrial devices. |
| Data retention | >200 years at 25°C - ensures nonvolatile storage integrity across product lifecycle without refresh. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage; no SPI mode bits or configuration registers required. |
| Timing (TWC) | 6 ms max erase/write cycle - deterministic latency for time-critical configuration writes; no external wait-state logic needed. |
| Temp range | −40°C to +125°C (Automotive E grade) - qualified for under-hood and motor-control applications per AEC-Q100 stress requirements. |
Pinout & Package
93LC56AX/SN is supplied in an 8-lead SOIC package (SN), with standard pinout matching industry Microwire EEPROMs. Pin 1 is CS; Pin 2 is CLK; Pin 3 is DI; Pin 4 is DO; Pin 5 is VSS; Pin 6 is NC (no internal connection); Pin 7 is NC; Pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; initiates self-timed erase/write on falling edge. |
| CLK (Pin 2) | Serial Clock | Rising-edge synchronized I/O; clock-stopped operation supported; TCKH/TCKL minima scale with VCC (e.g., 250 ns @ 2.5 V). |
| DI (Pin 3) | Data Input | Accepts Start bit, opcode, address, and write data; high-impedance when not selected; no pull-up required. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires external pull-up for status polling. |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; must be low-impedance path to system ground plane. |
| NC (Pin 6, 7) | No Connection | Internally unconnected; may be left floating or tied to VSS for mechanical stability; no electrical function. |
| VCC (Pin 8) | Power Supply | Supplies core and I/O circuitry; decoupling capacitor (0.1 µF) required within 10 mm of pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or software delay loops - reduces firmware complexity and improves write reliability. |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data remnants and ensuring deterministic initialization state. |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V VCC - prevents corruption during power-up/down transients without external supervisor IC. |
| Ready/Busy status via DO | Enables non-blocking polling instead of fixed delays - optimizes host CPU utilization during memory operations. |
| Sequential read mode | Allows continuous address increment with single CS assertion - accelerates bulk read of configuration blocks or lookup tables. |
Applications
| Motor Control Configuration Storage | Industrial Sensor Calibration Memory |
|---|---|
Use Scenario: Storing motor phase timing offsets, current limit thresholds, and encoder zero-point corrections in BLDC driver modules. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed at startup and updated during field calibration routines. Use Value: Enables factory and field recalibration without firmware reflash; 1M endurance supports >100 calibrations over 15-year product life. | Use Scenario: Retaining temperature-compensated gain/offset coefficients for pressure and humidity sensors in process automation transmitters. IC Role / Device Role / Timing Role: Persistent coefficient store read at power-on and written during sensor auto-zero sequences. Use Value: Maintains measurement accuracy across thermal cycles; 200-year retention eliminates periodic recalibration schedules. |
| Automotive Body Control Module (BCM) | Medical Infusion Pump Settings |
Use Scenario: Saving user-configurable lighting profiles, door lock behavior, and mirror position presets in automotive BCMs. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced directly to 8-bit MCU via GPIO-banged Microwire. Use Value: −40°C to +125°C rating ensures reliable operation in engine bay–adjacent mounting; Pb-free SN package meets automotive RoHS. | Use Scenario: Storing drug library parameters, flow rate limits, and alarm thresholds in battery-powered infusion pumps. IC Role / Device Role / Timing Role: Low-power nonvolatile memory accessed only during setup or error recovery. Use Value: 5 µA standby current extends battery life; write-protection logic prevents accidental dose parameter corruption during ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT/SN | 128 × 16-bit organization; same VCC range, timing, and package; no ORG pin - fixed x16 mode. | Requires 16-bit data path and address mapping; unsuitable for byte-addressed systems using 8-bit MCUs. | Select only if host controller natively supports 16-bit Microwire transfers and memory layout aligns with word-based access. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, 20 MHz max clock; no ERAL/WRAL; standard SPI opcodes. | Requires SPI peripheral instead of GPIO-banged Microwire; lacks auto-erase-all before write-all functionality. | Choose when migrating to SPI-based platforms or when higher clock speed (vs. 3 MHz max Microwire) is critical for throughput. |
Compared with 93LC56BT/SN and AT25020B-MAHL-T, the 93LC56AX/SN delivers optimal compatibility with legacy Microwire designs, deterministic 6 ms write latency, and hardware-enforced data integrity - making it the preferred choice for cost-sensitive, long-lifecycle industrial and automotive systems requiring minimal interface overhead.
Availability
93LC56AX/SN is available at Aetrix Electronics and suitable for motor control configuration storage, industrial sensor calibration memory, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and AEC-Q100–compatible nonvolatile memory.
Supply support for 93LC56AX/SN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56A/B/C series was designed specifically for low-power, pin-constrained embedded systems requiring robust, Microwire-compatible EEPROM with hardware write protection and extended temperature operation.
FAQ
What is the memory organization of the 93LC56AX/SN?
The 93LC56AX/SN has a fixed 256 × 8-bit (2 Kbit) organization with no ORG pin - it operates exclusively in x8 mode. Unlike C-versions, it does not support dynamic word-size selection. This simplifies address decoding in 8-bit microcontroller systems and eliminates external ORG biasing components.
Does the 93LC56AX/SN require an external pull-up resistor on the DO pin?
Yes, the 93LC56AX/SN requires an external pull-up resistor (typically 4.7 kΩ to VCC) on the DO pin to ensure valid logic-high levels during Ready/Busy status polling and read operations. Without it, DO cannot drive high-Z to a defined logic state, risking bus contention or incorrect status interpretation.
What is the maximum clock frequency supported by the 93LC56AX/SN at 3.3 V?
At VCC = 3.3 V, the 93LC56AX/SN supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1). This is determined by the 2.5–5.5 V VCC range condition, which applies to all 93LC56A/B variants. Exceeding this frequency risks setup/hold violations and command misreads.
How does the 93LC56AX/SN protect against accidental writes during power-up?
The 93LC56AX/SN incorporates hardware power-on reset logic that holds the device in Erase/Write Disable (EWDS) mode until VCC exceeds 1.5 V and stabilizes. This prevents spurious writes during voltage ramp-up. An explicit EWEN instruction is required before any ERASE or WRITE command can execute.
Is the 93LC56AX/SN pin-compatible with other 93XX56 family members in SOIC-8 packages?
Yes, the 93LC56AX/SN shares identical SOIC-8 pinout (SN) with all 93XX56A/B/C variants - CS (1), CLK (2), DI (3), DO (4), VSS (5), NC (6,7), VCC (8). However, functional compatibility depends on organization (x8 vs x16) and feature set (e.g., ORG presence), so direct substitution requires verification of opcode and timing behavior.
93LC56AX/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56AX/SN FAQ
1.How can I place an order for 93LC56AX/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AX/SN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 93LC56AX/SN reliable?
The price and inventory of 93LC56AX/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56AX/SN is usually 5 days.
3.What payment methods are accepted for 93LC56AX/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AX/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AX/SN?
93LC56AX/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AX/SN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 93LC56AX/SN?
For technical support, including 93LC56AX/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AX/SN requirements.
6.How does Aetrix verify that 93LC56AX/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56AX/SN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 93LC56AX/SN meets industry standards.
7.What is the process for return or replacement of 93LC56AX/SN?
All 93LC56AX/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AX/SN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 93LC56AX/SN part is unused and in its original packaging.
Return procedure for 93LC56AX/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56AX/SN Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24AA02UIDT-I/OT
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